If you have a good moveset for Yveltal, post an answer below and upvote the best ones. Remember, this is for competitive movesets, not in-game. Ability, EVs etc should be included. More guidelines here.

Yveltal is so cool ! I love it. I'm gonna buy Pokémon Y at christmas time so it's my gift after all my efforts at school, if ya all understand.

Yveltal: The Destruction Pokémon.

The Physical Variant:
Yveltal @ Choice Scarf:
Trait: Dark Aura
EV: 252 ATK / 252 Spe / 4 HP
Jolly Nature
• Rock Slide / Dragon Rush
• Phantom Force / Steel Wing
• Foul Play / Sucker Punch
• Acrobatics / U-Turn / Sky Attack
This guy has a lot of possibilities to run in a physical set. It's gonna be uber for sure. The first move is up to you: If you want a check against Ice, then Rock Slide may satisfy you. Yveltal must be able to outspeed other Scarf users in Ubers as Reshiram, that's why you have Dragon Rush, which also has a very good power, but an unreliable accuracy. Phantom Force is kinda a Shadow Force with more PP and less power, but not only it has a decent 90 basepower but also it has the ability to hurt for indeed admirable damage Giratina, which is quite common in Ubers as a phazer. On the other hand, Steel Wing inflicts decent damage and offers a check against Xerneas's fairy type, which is useful. Foul Play may use Zekrom and Rayquaza's respective honorable attack against themselves with a very nice 95 base, while Sucker Punchcan receive a priority boost if well used, against a choice user, to finish it. Ah! Yveltal has so much options! It's gonna be mine! It has the ability not to be deja vu, it has an admirable speed with a great offensive. It also has a pretty nice bulk. Acrobatics can be used with a Flying Gem, and thus hits for nasty damage against the foe, while Sky Attack benefits a power boost but for a 2 turns-attacking move. U-Turn can be used to scout and has a nice basepower.

My Advices:
• I would use Steel Wing on a special set using Big Root for Oblivion Wing, because without it, if Yveltal won't learn Sludge Bomb, Xerneas will enjoy to destroy the destruction.
• Shadow Ball can be used, but it provides the same exact coverage as it's inferior: Dark Pulse.
• U-Turn can be used in a mixed variant with Foul Play so that Yveltal can scout and won't find too much problems to do.
• Yveltal can be used in a team with a Pokémon that has Hidden Power [Dark] to get a maximum use of Dark Aura in a double battle.
• Yveltal can make a use of any other item than Choice Scarf, but the Scarf is mainly here to assure some more speed that Yveltal may need.
• Yveltal combines amazingly well with Greninja, which both are my favorite this gen alongside Heliolisk: Greninja has Dark Pulse which gets a boost of Dark Aura, but careful against fairies.

PHYSICAL

This Yveltal set is designed to take on some of the most prominent physical attackers of the Uber metagame. It's access to a faster-than-normal speed stat of 99 makes it the optimal Pokemon for creeping and with access to incredible utility moves like Taunt, Toxic, Foul Play and Roost it can do hefty damage to both physical attackers and stall. With instant recovery in the form of Roost, Yveltal can run Rocky Helmet, which can be hugely advantageous when facing down opposing EKiller who aren't quite OHKO'd by Foul Play. Taunt + Toxic shuts down every stall Pokemon ever to crawl around, while also severally crippling shaky set-up sweepers. This Pokemon is so amazing, it doesn't even fear Chickens or Ponies (that's blaziken and Arceus-Normal you noobs...).

Hmm. Rather disappointing movepool. Dark/Flying typing is not the end of the world, but it doesn't give very good coverage. Hurricane or Oblivion Wing depending if you want to use it in rain. If you choose to use it in rain, go for Roost to replenish Life Orb drain. Steel Wing is also an option to cover Fairy weakness, but at base 70 and 90% accuracy, I think Yveltal has better things to do than use Steel Wing.

I don't think Focus Blast is really that needed anymore considering that Steel no longer resists Dark. Focus Blast will still do more damage to a steel type that doesn't resist Fighting, but at least Dark Pulse is 100% accurate.

This is an unspoken monster in Ubers, where it completely dominates. Seeing that most Yveltal's run the usual Specs / Scarf set, this takes a different approach at killing everything off. The EV spread grants this monster the ability to make 101 Substitutes, thus making it take 2 turns for that annoying Chansey/Blissey to break it. The rest is thrown into speed and special attack, to obtain maximum speed and only losing about 11 or 12 SAtk points. Dark Pulse and Oblivion wing just destroy the whole tier, while Focus Blast is there to take out threats such as Ferrothorn, who can pose a problem with Hazards stacking for teammates. One can also opt for a Hasty or Mild Nature, and just run Rock Slide > Focus Blast for Ho-Oh, but that takes some very needed bulk.

Dark Aura is a great Ability. It increases Dark Pulse's Base Power from an iffy base 80 to a much more impressive 106, and slightly more. Yveltal may not have the best Sp. Attack for a BST 680 Uber, but having a main STAB Attack that would make a Special Earthquake look bad certainly helps. However, one of Yveltal's mains strengths by far is its Sucker Punch. This time, I like to think of Dark Aura as a Boost to Attack as apposed to Base Power. So, with the given Attack EVs, Yveltal has just 306 Attack, but with Dark Aura, Yveltal has the equivalent of a much more impressive 408 Attack. And with an 80 BP STAB, with the boost of a Life Orb, Yveltal's Sucker Punch is one of the strongest priority moves in the game, and you honestly will be losing out if you choose not to run it. It also greatly lessens the overall need to be fast and quite simply makes Yveltal much more useful. Speaking of Speed, the given EVs let Yveltal outrun Pokemon with a Base Speed of 95 or lower with a neutral Nature. You can run Hasty over Mild if you really want, but due to Yveltal's odd base speed there's virtually no reason whatsoever to increase the speed EVs. As a Mixed Attacker, a Defense lowering Nature is preferred over Sp. Defense, due to the fact that Yveltal's Typing is slightly better at switching in to Special Attacks(It also loses slightly fewer points) Next, Oblivion Wing acts as secondary STAB and covers Fighting Types. IMO Oblivion Wing is simply better than Hurricane. This is because of two reasons: 1) Outside of Rain, Hurricane is weaker on average, at 77 Base Power, not to mention that its accuracy will annoy you to hell and back 2)Oblivion Wing also has a vastly superior side effect that greatly improves its Tanking Ability. Whenever something outspeeds it, that it cannot OHKO outright, Yveltal can use Oblivion Wing to greatly minimize the overall damage and then potentially follow up with Sucker Punch to achieve the KO. For this very reason Dark Pulse already is not always the best move to use, even though it's much more powerful, and Hurricane is pretty comparable to Dark Pulse in that regard. Even with Rain support, Hurricane is still very questionable over Oblivion wing. Focus Blast is a bit of a luxury move; while there are a handful of things that Yveltal needs Focus Blast for, coverage-wise, it also tends to be useful for its ability to simply hit things Super Effectively. It's nice to quickly remove the Normal, Steel, and Dark Types and make the game just a little bit easier. Of course, you cannot be blamed for running Roost Instead, though Oblivion Wing helps for recovery.

The purpose of this set is to get a substitute up,get hit with a super effective move,let the weakness policy activate through the substitute,and just sweep after that.
If the opponent is faster then you it's not that much of a problem because Yveltal still has good natural bulk on his own.

Unfortunately, Yveltal's Special set is more limited. It can use maximum 6 strong special attack, here are your 4 best: Dark Pulse provides a deadly STAB with Dark Aura and the EV spread, leading to some massive damage for one use + 20 % flinch chance. Focus Blast has a respectable 120 basepower alongside 70 % of accuracy and misses sometimes, but usually it hits hard for some amazing damage, and provides a check against both Rock and Ice, which Yveltal dislikes. Oblivion Wing is a recovery STAB form for my beloved bird, and not only will recover most of the HP it did, meanwhile, 75 % I guess, 87.5 % with a Big Root, but also being a STAB means you inflict more, and recover more, especially against a weakened treat. Finally, Psychic is some nice damage and is quite the threat against Fighting Pokémon.

wide lens increases hurricanes accuracy drastically , psychic kills fighting pokes and on the contrary it lowers the opponents sd while phantom force psychic and ghost dark pulse for obvious reasons and when boosted with stab and probably evs it is a KO . steel wings well they can finish fairy, ground, and ice pretty easily also it raises sd a good thing.

Alright, I'm new to this. My moveset will probably suck, but just deal with it. And Yveltal has a horrible move pool, so some moves you need to use just as fillers. And I pretty much stick to the basics, anyway.

Yveltal @ Life Orb
Nature: Serious (neutral natures are fine, but if you want something different you could try Brave or Quiet.)
252 HP /128 SAtk /128 Atk

Dark Pulse (Good STAB move, boosted by Dark Aura and has 20% Flinch)

Oblivion Wing (Good STAB, restores HP for Life Orb loss)

Phantom Force / Steel Wing (I would suggest Steel Wing, because it gives good coverage for Yveltal, but if you want something with better accuracy, you could go with Phantom Force.)

Sucker Punch / Psychic (Sucker Punch could do priority damage with STAB and Dark Aura and, but if you think that Dark Pulse is good enough then you can use Psychic.)

Dark Pulse is STAB Dark Aura power, Oblivion Wing for STAB recovery while attacking, Focus Blast is powerful coverage, and Dragon Rush to deal with dragons. Unfortunatly, he can't learn an ice type move or special dragon move to use instead, so that's the dragon coverage you have. Not really terrible, but his moves really lack coverage of much quality.

Dark Pulse for STAB, boosted by Dark Aura
Hurricane for power or Oblivion Wing for healing and reliability. Won't be achieving the same KO's as Hurricane though.
Knock Off is a new toy its received through the ORAS move tutors and removes items from opposing Pokemon. Even with the attack minus nature (if using Modest) it still has good power backed up by STAB and Dark Aura.
U-Turn is a great move on Choice Scarfer's and is there to scout and for chip damage.

Other options include Hyper Voice which hits through Substitute, Heat Wave or Focus Blast for a stronger hit on Steel types and Foul Play for a strong hit against physical attackers.